Set up the infrastructure for Extension event metrics.

chrome/browser/extensions/api/feedback_private/feedback_private_api.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/feedback_private/feedback_private_api.h"
 
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 70 matching lines @@
     info.system_information.reset(new SystemInformationList);
     // The manager is only available if tracing is enabled.
     if (TracingManager* manager = TracingManager::Get()) {
       info.trace_id.reset(new int(manager->RequestTrace()));
     }
 
     scoped_ptr<base::ListValue> args(new base::ListValue());
     args->Append(info.ToValue().release());
 
     scoped_ptr<Event> event(new Event(
-        feedback_private::OnFeedbackRequested::kEventName, args.Pass()));
+        events::UNKNOWN, feedback_private::OnFeedbackRequested::kEventName,
+        args.Pass()));
     event->restrict_to_browser_context = browser_context_;
 
     EventRouter::Get(browser_context_)
         ->DispatchEventToExtension(kFeedbackExtensionId, event.Pass());
   }
 }
 
 // static
 base::Closure* FeedbackPrivateGetStringsFunction::test_callback_ = NULL;
 
@@ skipping 133 matching lines @@
 
 void FeedbackPrivateSendFeedbackFunction::OnCompleted(
     bool success) {
   results_ = feedback_private::SendFeedback::Results::Create(
       success ? feedback_private::STATUS_SUCCESS :
                 feedback_private::STATUS_DELAYED);
   SendResponse(true);
 }
 
 }  // namespace extensions